feat(registry): AssetResolver + diffuser supplier curves (Jäger / Aerostrip / PIK / PRK)

Two related changes bundled together because the diffuser curve files
only make sense once the registry namespace they live in exists.

src/registry — new asset-metadata resolver:
- AssetResolver with synchronous resolve(namespace, id) + lazy cache,
  async refresh() for future remote pulls.
- FileBackend (per-id or single-file layouts, case-insensitive) and a
  stub HttpBackend (disabled unless EVOLV_ASSET_REMOTE=1).
- Namespaces: curves, menu, monsterSamples, monsterSpecs, units. Menu
  namespace re-keys by inner softwareType + filename so editors that
  pass either string resolve to the same tree.
- README explains how to add a namespace.
- AssetCategoryManager (datasets/assetData/index.js) becomes a thin
  facade over the resolver so existing consumers don't move.
- 246/246 tests pass — including the 39-test registry suite.

datasets/assetData — file moves + new diffuser data:
- modelData/*.json deleted; curves/*.json is the canonical home.
- New diffuser.json menu tree with GVA, Jäger, Aquaconsult/Entec,
  PIK/PRK suppliers.
- gva-elastox-r.json migrated from the inline _loadSpecs hardcode,
  re-tagged coverageBasis="bottom-coverage-pct" (the legacy 2.4
  elements/m² was a prior mis-conversion; we can't recover the
  original % so it's a single-point curve under key "0").
- jaeger-jetflex-td-65-2-g-epdm-1000.json — extracted from the Jäger
  EPDM-1000mm SSOTE/DWP chart on the data sheet (vector-PDF read).
  SSOTE 8.20→6.40 %/m, DWP 25→48 mbar across Q 2-12 Nm³/h. Single
  coverage (vendor doesn't state test conditions).
- aerostrip-phoenix.json — 4-coverage SOTE family at 4.75 m water
  depth (DD 5/10/15/20 %, flux 10-70 Nm³/h·m²) from the Entec/de
  Winter 2023-11-22 dataset; DWP curve from the 21 % @ 4.05 m chart.
- pik300.json / prk300.json — 5-coverage SOTE + SSOTR (DD 5-25 %)
  with split DWP per model variant, water depth ≈ 4.0 m inferred from
  the SOTE↔SSOTR ratio in the source spreadsheet.

src/configs/diffuser.json:
- New asset.{model, assetTagNumber} block so the editor's selected
  model id survives validation.
- diffuser.density description corrected to "Bottom coverage [%]";
  default 2.4 → 15 (typical fine-bubble install).

src/configs/{rotatingMachine,valve}.json: small alignment edits that
came with the registry phase.

src/menu/asset.js + src/menu/aquonSamples.js: rewritten as facades
over assetResolver, keeping the editor-side cascade behaviour intact.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/menu/aquonSamples.js

@@ -1,41 +1,30 @@
-const fs = require('fs');
-const path = require('path');
+'use strict';
+
+// AquonSamplesMenu is now a thin facade over assetResolver.
+// Backed by namespaces `monsterSamples` (sample codes, indexed by code)
+// and `monsterSpecs` (sampling defaults + per-sample overrides).
+
+const { assetResolver } = require('../registry');
 
 class AquonSamplesMenu {
-  constructor(relPath = '../../datasets/assetData') {
-    this.baseDir = path.resolve(__dirname, relPath);
-    this.samplePath = path.resolve(this.baseDir, 'monsterSamples.json');
-    this.specPath = path.resolve(this.baseDir, 'specs/monster/index.json');
-    this.cache = new Map();
-  }
+    // relPath retained for signature compatibility with the previous on-disk
+    // implementation; unused — the registry owns file locations.
+    constructor(/* relPath */) {}
 
-  _loadJSON(filePath, cacheKey) {
-    if (this.cache.has(cacheKey)) {
-      return this.cache.get(cacheKey);
+    getAllMenuData() {
+        const samples = assetResolver
+            .list('monsterSamples')
+            .map((id) => assetResolver.resolve('monsterSamples', id))
+            .filter(Boolean);
+        const specs = assetResolver.resolve('monsterSpecs', 'all') || { defaults: {}, bySample: {} };
+        return {
+            samples,
+            specs: {
+                defaults: specs.defaults || {},
+                bySample: specs.bySample || {},
+            },
+        };
     }
-
-    if (!fs.existsSync(filePath)) {
-      throw new Error(`Aquon dataset not found: ${filePath}`);
-    }
-
-    const raw = fs.readFileSync(filePath, 'utf8');
-    const parsed = JSON.parse(raw);
-    this.cache.set(cacheKey, parsed);
-    return parsed;
-  }
-
-  getAllMenuData() {
-    const samples = this._loadJSON(this.samplePath, 'samples');
-    const specs = this._loadJSON(this.specPath, 'specs');
-
-    return {
-      samples: samples.samples || [],
-      specs: {
-        defaults: specs.defaults || {},
-        bySample: specs.bySample || {}
-      }
-    };
-  }
 }
 
 module.exports = AquonSamplesMenu;